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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb0efb167dcde5fdbddd3f3497df344817385f1e6cb19b05985fce70faf8a94' 
  AND token = 'FgcbHAuDm2IPQe2YVy/74VIJuEbrdvnTyfi98+uBZjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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