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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf7c34cc1931ef6726b76301b3b665d88f213910475ddeadec58eb0b67c2425' 
  AND token = 'rULMICVC5sw/iTrfKocPXGMVm17iCIAqz/QEh9nSK1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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