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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddea8e8ce413e30ea7047176c5229eaafd6c025062e9593bd7c36ac5dab2fa11' 
  AND token = 'zYMPkyTbUXhqOLYQxpteItJDfovRn7JedvGvCuWQPh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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