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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739f26ffc91543021a295fb2e169b3066d9a43518b2cd70970d6893eacbbac75' 
  AND token = '9eC3AS51RS8vdZ15t6WlUZ6JVtpH0ZCos0nGNzQOgz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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