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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befb518d836a921e4fd650c0275baadc4f8f9eeb7f71b47184ca83371e7299fc' 
  AND token = 'jgrJ0kUOO9FaAkx7HNUqWudDAs29Dxzd+C3Ry7tE2eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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