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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0396e1423b49d8d43351f0280f0ad31a8f8400b31e6a48a64774805cab94b229' 
  AND token = 'ti53QuSa/JY78fADi2vcjdyzaBhXJs8eTR6ghKbeaS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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