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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfc8c4c9fa7ea1c51c35e8824adf880b5b6ee56ecc6254b4d1a4fd11442458d' 
  AND token = 'WCl3fg6skZFk0QClXCLMRdt+F3IHY7fjB18kw8xanLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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