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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e925d53c5c4b10c59e40dcb43d9c5174da24eb5ab977f6c24e039dd28785b372' 
  AND token = 'dCsKkKTW/MtH703u4yvYX7OXyI16uKJz5bg2tqBpNuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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