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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c79669880b06fed0712d4a11745b37ab7e3633906911ffa41b9df376524f41' 
  AND token = '3gJcGMZAvF69nU9h1EEY7aYl0A4tvDcoqOJfQq7mjhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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