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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8ed4c2d8a19b1995e9c4c5e3f02b862a06705bfea5a59bcdebdc75cd87c4e5' 
  AND token = 'NU8ZfdpLX6EGRUqhXHuW/d+t9qgVcLnhnGq6D0y8/qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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