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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ba8eadec871178b651a124598d6f91b5186422f8e3d5da15128bd3e4ffb899' 
  AND token = 'gu7rwjya1RQDRNBB2Xmansj3eP5mKXf1aBTpmabjddo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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