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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe234a3aca1703d5a62380391766ce6f0411f3913b19199e7f506234799349f' 
  AND token = 'nd7MekqS8mWTV30f3u4XXE23oDEg/gA9H7qwq+1S4y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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