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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa7fc29e2e49c06f7234ba4c9f0b90d953a9dda4cbe84b751e93ceff6ae5902' 
  AND token = 'xWB6uhA23Y4qVoM7/EcSI9g8zvz1qEa/U2mNTLQ/u2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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