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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43bb09c77dcefaabd53b050ecc6e3e37b9909f5b43f699690d19b9392f48041' 
  AND token = 'KrN1nCEeKyYmD6zlbl2NmVIHQ9YOO05kSDTcHAbZaWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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