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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb1599a474b17db0696e33c85d7b27908234162c89c629f4aea6ebfbac5059a' 
  AND token = 'UMRQArxBdJwgSuUutmLztcQ+FtRQJ/mW7LWTzRds7vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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