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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d917b050b0d8b5edf0f9b414295cf16511e968b3e1ba4953b39a71f7f9f774' 
  AND token = 'ZuNwmNgxMsxBequfZ0PNGFmjEPtqfdAMwu+7tfA2K1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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