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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2accbeeb14036c9d697eacfc095084d086e71b174b49ce5c96a134a4c9054ec' 
  AND token = '5bmUsobv/wMNr8FICkHEgZ19H9CKXAqFVARmqWFaCh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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