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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd728170172db6d412acde6fb6a8ccb724dce2838e93a930b71824be5d09d362' 
  AND token = 'NAO/0dzkS9JM3PPP748ckagj1OimTu7rLHB8VSYSBfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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