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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0312dafc4cc5776be6f2517a6a303316dedc1022a966dd96f8c0008569e90dd6' 
  AND token = 'gUbYVfJy3WbjoD9wMoUiT8l/Uy2DuVzi71XeDd5ydts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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