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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba944096cb3291f164652e1650c7c802fb91052b93603274556d59d753a1bb1' 
  AND token = 'YMpu8F82hPu03BKPfvvFpSPH+19SgokfrSnU75lZ2dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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