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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac711aaa35fcd9927895343c16fc6c771d0d57e3052f57e98deccfa29e59fb1' 
  AND token = 'fa4e7CkPn7meJlNM5wZ7DUz0ljszUJ3/K6eODtAmPk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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