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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fedca0ce8db34710e98a74cf850635915a82d6e728969fa3222ce5ec2ef8d3d3' 
  AND token = 'N7F82aVJ6R1/C0SCcOTY088x4LBSL840MoP0MQBlxB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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