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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9f5ce699c41bfe7e296df89da5c0e9ddd276c13d2f24feb72424b4d83ef8b1' 
  AND token = 'u2hlkTWLnfRTkySdi8Kw+s7BqmqUIwYQ06xOJ4Oa0oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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