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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14737eb2f47110b95d88c629b641edf78d588ce863db50c7999a2a53c0da899' 
  AND token = 'ki9Sh+FkSvGKSQ0O9nWhY1iXHmG1RMfpyO+/ybT6AOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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