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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e4247c9a2d9333a57f5853da13b34d0c1ffd6f97b2c3395dd3dbb6b13e9f88' 
  AND token = 'iZ/WQhYsbI4bOnSPnDRoBmsp/lSDFrMTiGtbN+7oWEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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