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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999295c2e17ea1b1607c0ff76d8c8d79be3f5db2d22fd1d115353c38fa13f300' 
  AND token = '5suTAZJanDUHnSW3RUGlY0DpWUFw0P6ar9I9N6nC9I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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