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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa4205c37ff611fa31a27f7c79fa9cbbcbc7e3bef362d5d82496a8eb5cee992' 
  AND token = 'FNwQyPZi6nLbeeWMSJn5NwsVKn5VIuvVuqSdfhN03bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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