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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2856da6b41b770de24331a2f8bf52b99eb320906e58ce871ad51f63066d680f8' 
  AND token = '6FyIQe3A52W5hMa7jP01wuIsVWvJsKfNe+ltdzvSRNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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