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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7125a3e3c04dbaeaaa3dc462e85dec9f158fb06ea6843f2d8fc9d5aea2c0faba' 
  AND token = 'fbjTG/qwCCaJ3Z7ajgKFcOgiszQ6XjuMZp8c0zBi7B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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