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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb2bf076db0d9b63a8a8a4fb4dc133a371239ca028cb6f95fab280102f8df47' 
  AND token = 'QMBwH/m2l20YYwSeA8GlWlWJ60Jyzf9iku+OtVan+Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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