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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1751076b42ed97a8c908425049b4840a5d1740c62796da3f0aa9d506176415a7' 
  AND token = 'XEuEcKFyAwXQCjr0RFwgLSiuAEdP0ej18fYy6VLkghI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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