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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b67ec4a7a70355d8f6f3e3ea521952a54ab624c1fa782fe5a937bc0ff41e9e' 
  AND token = 'PUz9CdaCD5pUDiMiB9ex45Tcu/NX1+hkOYMspx/VWcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}