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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cbd077569c9eff58ff522d1da24b27bba41a7399e0fe2128bba42d6e62a55f' 
  AND token = 'RwdsBtBfOmDSj36SNC4Y6U/l5GKG7rxpWcApBaRahFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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