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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fc36d2c34ce2ba8a422ab5a45fb35d4ba92b52fc6a1732fd49093787bc6443' 
  AND token = 'wSaECZdSagj4Se7rl3F3+he+uaeuAbutSTdcqs0TKXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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