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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8486a5806b1e35b3e3140b68ea2b372bcb610594546e1e4637cd3508ef0eb2f1' 
  AND token = 'u9MSCXgeKzYgyWIBcYlpF/DbPBsFXuJpNDzMkrizKeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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