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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf3a78792bd577d603647fd5edec8a6b4e40d02e701b42773366a493ba44ed5' 
  AND token = 'CqAULDw1e251gwm4q/kCUKC7Bd/vJH9E73B6tCkwUBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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