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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bee725bb661ec07ba6c299922b33159264f89e0c53172fb7348ab7354ab0f1e' 
  AND token = 'KcB15LN3xWKXx5gQQqp4HlTeziyUxLDfgvTxn3wDEaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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