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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec3ce8485978c2133a27dc03ed0b90183e7da18b7099820d147ef3faac5bab4' 
  AND token = 'l47nrXU4O+RjcAndhBKz6pBzOCVeZxK4bL7SErBU+vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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