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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3367f8aa4d4be5924a54d7f8ffe257f3dc4029b44ed84bd1504655c49bf2a38f' 
  AND token = 'dBbwQqL66DtlqS7cRlX2T8zyvQWMjNgaeM2ZxTdIVZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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