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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99762122002249daa692e0e760a5ecb7264e28ce778b97409fa9877c3e6a3d1f' 
  AND token = 'WpP30cI4eHPQm6+GE3jBVZwNTGw20yHfJ4Q/Qfcm/VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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