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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98565d407b782da957617ad224c663d1ea6e0218ff13b80c48bc76cda9ea7b9b' 
  AND token = 'SMpfaztTTEB80xogD2yuFD1I+LXJFst/OdXEJbbAtW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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