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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a3e4767e34151517061a7c01d4218b07617d3ab623557a6cb577b449751ce5' 
  AND token = 'cdRAzSx7NC/QsGxIO4duQ3R3BaykLcut4D17evoT58M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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