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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c05167eb794a083a8742b6ae5e618ddd273c44035345a689f7f9de1790d68ec' 
  AND token = 'jJsQNtzvtnj7jbFGUQ8hIFRy/K/e5Ime9tucFd5UeDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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