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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf39787ce0c1f90c3b6456cfe346e59e0ffc4767cded4de1b7d0342be194c5d' 
  AND token = 'emo2Q+v9z7+QMjp1daSkLFCoDvnIm0OPgabZqfCr5xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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