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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898f0100a7b29feac96d37785c60c8dda312ffcd7df0093ca19a4d4530fb2ebe' 
  AND token = 'ty0NtJImZ/NTUqL5ycUP/srAI5GvrdFF4p3hxQk4slc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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