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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac39c3da53d471d1626fb200344bafe2d7c9e5dfd70937514579c4c98eb36570' 
  AND token = 'MVF8MaNDfYUrfVnEg/SRhjO2Oz9T/u3NoNzuh7BPJLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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