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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70901fdf1c0ff9c4a9923f84178df926d12309fdf2bc1df4348d2a198e30e92' 
  AND token = 'iVGHF/JlvEPi/HTRzBqWCB1iDBTiMqVvNhXyF5qLGfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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