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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deca07e8b1dda6a857590ca46957aa7f726bcdd3b4bb4bc7f42cf9bc6e11a8f1' 
  AND token = '91vbUuUVr3pfWfssPb0m5QLu6fRuOdcpCwiD3lvH0Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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