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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540a7ac1e2e5b2fdd1dd05c23bcb828b500fd332fdc75a343bb3a5bac61f54e7' 
  AND token = 'lTSSpZUUHNas/nHS5vOCMPPpWkW3Wf2JxIanggh3g5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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