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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e4bc8fae3cd4de97d881cc8cbda4e976a389774eda186b5fec4912039028d0' 
  AND token = 'qUPuRc24NboBY8OPdfxXDRo66rKcvSGTk7wyNoSjsws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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