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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd979d251c2be0d7f5dcaa520a457a02504c60b819f0df248a2064cf5bf8db234' 
  AND token = 'qayyQylPWXC3GkIisYAKmCh3egVyBgcef2JBFAHZNOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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