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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5571bc34082d401e05641bd19ef288ea6eb30ad38d720cadf0d174aeae7fb2' 
  AND token = 'W38fP1o1NbOv3+vu9YMNviO9iCYaxlDlDK/UUhz45vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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